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{- QuickCheck with additional instances
-
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-# LANGUAGE TypeSynonymInstances, CPP #-}
module Utility.QuickCheck
( module X
, module Utility.QuickCheck
) where
import Test.QuickCheck as X
import Data.Time.Clock.POSIX
import System.Posix.Types
#if ! MIN_VERSION_QuickCheck(2,8,2)
import qualified Data.Map as M
import qualified Data.Set as S
#endif
import Control.Applicative
import Prelude
#if ! MIN_VERSION_QuickCheck(2,8,2)
instance (Arbitrary k, Arbitrary v, Ord k) => Arbitrary (M.Map k v) where
arbitrary = M.fromList <$> arbitrary
instance (Arbitrary v, Ord v) => Arbitrary (S.Set v) where
arbitrary = S.fromList <$> arbitrary
#endif
{- Times before the epoch are excluded. -}
instance Arbitrary POSIXTime where
arbitrary = fromInteger <$> nonNegative arbitrarySizedIntegral
instance Arbitrary EpochTime where
arbitrary = fromInteger <$> nonNegative arbitrarySizedIntegral
{- Pids are never negative, or 0. -}
instance Arbitrary ProcessID where
arbitrary = arbitrarySizedBoundedIntegral `suchThat` (> 0)
{- Inodes are never negative. -}
instance Arbitrary FileID where
arbitrary = nonNegative arbitrarySizedIntegral
{- File sizes are never negative. -}
instance Arbitrary FileOffset where
arbitrary = nonNegative arbitrarySizedIntegral
nonNegative :: (Num a, Ord a) => Gen a -> Gen a
nonNegative g = g `suchThat` (>= 0)
positive :: (Num a, Ord a) => Gen a -> Gen a
positive g = g `suchThat` (> 0)
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